摘要
网格质量对数值求解的稳定性及精度是至关重要的。结构化网格以其节省内存和便于节点编号等优点被广泛使用。许多流动分析商业软件均采用结构化网格进行数值求解，然而对于几何形状复杂的通道，如何提高网格质量，尤其是网格的正交性成为计算成败的关键。带支墩的不完全蜗壳是水轮机中几何形状复杂的通流部件之一，本文结合一个轴流项目专题着重研究了蜗壳，探讨了不完全蜗壳结构化网格划分中的一些处理方法，并通过求解平均化Navier－Stokes方程进行了流动分析计算。比较了优化蜗壳与原型蜗壳对水轮机水力性能的影响，通过数值损失和沿圆周液流角的变化确定了该问题合理的节点数。
Grid quality is crucial to insure calculating accuracy and stability. Structured grids are applied widely in many of commercial software due to its lower memory consuming and its convenient grids numbering. However, for the complicated flow passage, improving grids quality, in particularly, its orthogonality become key to find solution. Semi_spiral with a pier is one of the most complex flow passage in water turbine. In present research, we studied a semi_spiral by solving the averaged Navier_Stokes equation, and discussed the treating method in generating structured grids. We compared their hydraulic performance for different spiral casing. The reasonable nodes be decided by the change of numerical energy loss and flow angle along circle.
出处
《大电机技术》
北大核心
2001年第4期36-40,共5页
Large Electric Machine and Hydraulic Turbine
